# Finding reverse sat current of pn junction diode

1. Nov 2, 2008

### ralph13

1. The problem statement, all variables and given/known data
Determine reverse sat current of diode. To show and explain approach. Given-IV characteristics of diode and tabulated values for forward bias voltage from 0-0.8v and corresponding current values.

2. Relevant equations
At which point do I need to consider to find the reverse sat current

3. The attempt at a solution
using formula of ideal diode current densityfor an abrupt pn junction diode??

2. Nov 4, 2008

### noumed

it's been a while since i've done diode problems... but from the IV characteristics graph, can't you determine the reverse sat current from the graph? not sure if forward bias voltages help, because you need the diode to be reverse biased (V < 0V) to see reverse sat current... did that help? or maybe i'm just not understanding your question..

3. Nov 5, 2008

### Redbelly98

Staff Emeritus
Welcome to PF, ralph13.

If you are only given or shown the i-v for positive values, between 0 and 0.8V, that rules out a direct observation.

Do you have a general equation for a diode's i-v characteristic?